Loans (Details 2) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012
Aged analysis of past due loans
30-59 Days Past Due	$ 2,244	$ 6,529
60-89 Days Past Due	434	6,357
90 Days or Greater Past Due	45	89
Total Past Due	2,723	12,975
Current	1,031,355	1,059,556
Nonaccrual	43,562	77,519
Total Loans	1,077,640	1,150,050	1,208,289
Recorded Investment 90 days or Greater Past Due and Accruing	45	89
Commercial
Aged analysis of past due loans
30-59 Days Past Due	69	159
60-89 Days Past Due	132
Total Past Due	201	159
Current	97,796	92,080
Nonaccrual	29	762
Total Loans	98,026	93,001	84,667
Real estate - commercial
Aged analysis of past due loans
Total Loans	554,874		621,715
Real estate - commercial | Owner occupied general purpose
Aged analysis of past due loans
30-59 Days Past Due	165	1,580
60-89 Days Past Due		50
Total Past Due	165	1,630
Current	109,584	119,994
Nonaccrual	3,497	5,487
Total Loans	113,246	127,111
Real estate - commercial | Owner occupied special purpose
Aged analysis of past due loans
30-59 Days Past Due	650	172
60-89 Days Past Due	227
Total Past Due	877	172
Current	162,435	149,439
Nonaccrual	5,947	11,433
Total Loans	169,259	161,044
Real estate - commercial | Non-owner occupied general purpose
Aged analysis of past due loans
60-89 Days Past Due		1,046
Total Past Due		1,046
Current	128,084	128,817
Nonaccrual	7,273	13,436
Total Loans	135,357	143,299
Real estate - commercial | Non-owner occupied special purpose
Aged analysis of past due loans
60-89 Days Past Due		4,304
Total Past Due		4,304
Current	75,595	69,299
Nonaccrual	438	477
Total Loans	76,033	74,080
Real estate - commercial | Retail properties
Aged analysis of past due loans
Current	39,829	37,732
Nonaccrual	5,056	10,532
Total Loans	44,885	48,264
Real estate - commercial | Farm
Aged analysis of past due loans
Current	16,094	23,372
Nonaccrual		2,517
Total Loans	16,094	25,889
Real estate - construction
Aged analysis of past due loans
Total Loans	30,996		48,606
Real estate - construction | Homebuilder
Aged analysis of past due loans
Current	4,563	4,469
Nonaccrual	168	1,855
Total Loans	4,731	6,324
Real estate - construction | Land
Aged analysis of past due loans
Current	4,640	2,747
Nonaccrual	209	254
Total Loans	4,849	3,001
Real estate - construction | Commercial speculative
Aged analysis of past due loans
Current	8,811	10,755
Nonaccrual	3,534	6,587
Total Loans	12,345	17,342
Real estate - construction | All other
Aged analysis of past due loans
30-59 Days Past Due		300
60-89 Days Past Due		215
90 Days or Greater Past Due		68
Total Past Due		583
Current	8,323	14,360
Nonaccrual	748	557
Total Loans	9,071	15,500
Recorded Investment 90 days or Greater Past Due and Accruing		68
Real estate - residential
Aged analysis of past due loans
Total Loans	376,859		436,837
Real estate - residential | Investor
Aged analysis of past due loans
30-59 Days Past Due	213	276
60-89 Days Past Due		164
Total Past Due	213	440
Current	122,031	140,141
Nonaccrual	8,307	9,910
Total Loans	130,551	150,491
Real estate - residential | Owner occupied
Aged analysis of past due loans
30-59 Days Past Due	625	3,151
60-89 Days Past Due		375
90 Days or Greater Past Due		21
Total Past Due	625	3,547
Current	112,515	110,735
Nonaccrual	5,858	9,918
Total Loans	118,998	124,200
Recorded Investment 90 days or Greater Past Due and Accruing		21
Real estate - residential | Revolving and junior liens
Aged analysis of past due loans
30-59 Days Past Due	522	888
60-89 Days Past Due	75	203
90 Days or Greater Past Due	45
Total Past Due	642	1,091
Current	124,170	134,990
Nonaccrual	2,498	3,771
Total Loans	127,310	139,852
Recorded Investment 90 days or Greater Past Due and Accruing	45
Consumer
Aged analysis of past due loans
30-59 Days Past Due		3
Total Past Due		3
Current	2,570	3,075
Nonaccrual		23
Total Loans	2,570	3,101	3,167
All other
Aged analysis of past due loans
Current	14,315	17,551
Total Loans	$ 14,315	$ 17,551	$ 13,297